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/*! \file
    \brief Unit tests for thread-level GEMM
*/

#include "../../common/cutlass_unit_test.h"

#include "cutlass/aligned_buffer.h"
#include "cutlass/half.h"
#include "cutlass/gemm/warp/mma_tensor_op_sm70.h"
#include "cutlass/epilogue/warp/fragment_iterator_volta_tensor_op.h"

#include "cutlass/core_io.h"
#include "cutlass/util/host_tensor.h"
#include "cutlass/util/tensor_view_io.h"

#include "cutlass/util/reference/host/tensor_fill.h"
#include "cutlass/util/reference/host/tensor_compare.h"
#include "cutlass/util/reference/host/gemm.h"

/////////////////////////////////////////////////////////////////////////////////////////////////

TEST(SM70_Epilogue_warp_FragmentIterator, mma_f16_64x64x4) {
    using Shape = cutlass::gemm::GemmShape<64, 64, 4>;
    using ElementA = cutlass::half_t;
    using ElementB = cutlass::half_t;
    using ElementC = cutlass::half_t;
    using LayoutA =
            cutlass::layout::ColumnMajorVoltaTensorOpMultiplicandCongruous<
                    cutlass::sizeof_bits<ElementA>::value>;
    using LayoutB =
            cutlass::layout::RowMajorVoltaTensorOpMultiplicandBCongruous<
                    cutlass::sizeof_bits<ElementB>::value>;

    using Policy = cutlass::gemm::warp::MmaTensorOpPolicy<
            cutlass::arch::Mma<cutlass::gemm::GemmShape<16, 16, 4>, 32,
                               ElementA, cutlass::layout::ColumnMajor, ElementB,
                               cutlass::layout::RowMajor, ElementC,
                               cutlass::layout::RowMajor,
                               cutlass::arch::OpMultiplyAdd>,
            cutlass::MatrixShape<1, 1> >;

    using MmaTensorOp = cutlass::gemm::warp::MmaVoltaTensorOp<
            Shape, ElementA, LayoutA, ElementB, LayoutB, ElementC,
            cutlass::layout::RowMajor, Policy>;

    cutlass::HostTensor<cutlass::half_t, cutlass::layout::RowMajor>
            accumulator_tensor({Shape::kM, Shape::kN});

    cutlass::reference::host::TensorFill(accumulator_tensor.host_view(),
                                         ElementC(-1));

    for (int tid = 0; tid < 1; ++tid) {
        typename MmaTensorOp::IteratorC::Fragment accumulator_tile;

        CUTLASS_PRAGMA_UNROLL
        for (int i = 0; i < accumulator_tile.size(); ++i) {
            accumulator_tile[i] = ElementC(i);
        }

        using FragmentIterator =
                cutlass::epilogue::warp::FragmentIteratorVoltaTensorOp<
                        cutlass::gemm::GemmShape<64, 64, 4>,
                        cutlass::gemm::GemmShape<32, 32, 4>, cutlass::half_t,
                        cutlass::layout::RowMajor>;

        FragmentIterator frag_iterator(accumulator_tile);

        typename FragmentIterator::Fragment frag;

        for (int iter = 0; iter < FragmentIterator::kIterations; ++iter) {
            frag_iterator.load(frag);
            ++frag_iterator;

#if 0
      std::cout << "T" << tid << ": ";
      for (int i = 0; i < frag.size(); ++i) {
        std::cout << "  " << frag[i];
      }
      std::cout << std::endl;
#endif
        }
    }
}

///////////////////////////////////////////////////////////////////////////////////////////////////

TEST(SM70_Epilogue_warp_FragmentIterator, mma_f32_64x64x4) {
    using Shape = cutlass::gemm::GemmShape<64, 64, 4>;
    using ElementA = cutlass::half_t;
    using ElementB = cutlass::half_t;
    using ElementC = float;
    using LayoutA =
            cutlass::layout::ColumnMajorVoltaTensorOpMultiplicandCongruous<
                    cutlass::sizeof_bits<ElementA>::value>;
    using LayoutB =
            cutlass::layout::RowMajorVoltaTensorOpMultiplicandBCongruous<
                    cutlass::sizeof_bits<ElementB>::value>;
    using LayoutC = cutlass::layout::RowMajor;

    using Policy = cutlass::gemm::warp::MmaTensorOpPolicy<
            cutlass::arch::Mma<cutlass::gemm::GemmShape<16, 16, 4>, 32,
                               ElementA, cutlass::layout::ColumnMajor, ElementB,
                               cutlass::layout::RowMajor, ElementC,
                               cutlass::layout::RowMajor,
                               cutlass::arch::OpMultiplyAdd>,
            cutlass::MatrixShape<1, 1> >;

    using MmaTensorOp = cutlass::gemm::warp::MmaVoltaTensorOp<
            Shape, ElementA, LayoutA, ElementB, LayoutB, ElementC,
            cutlass::layout::RowMajor, Policy>;

    cutlass::HostTensor<ElementC, LayoutC> accumulator_tensor(
            {Shape::kM, Shape::kN});

    cutlass::reference::host::TensorFill(accumulator_tensor.host_view(),
                                         ElementC(-1));

    for (int tid = 0; tid < 1; ++tid) {
        typename MmaTensorOp::IteratorC::Fragment accumulator_tile;

        CUTLASS_PRAGMA_UNROLL
        for (int i = 0; i < accumulator_tile.size(); ++i) {
            accumulator_tile[i] = ElementC(i);
        }

        typename MmaTensorOp::IteratorC iterator_C(
                accumulator_tensor.host_ref(), tid);
        iterator_C.store(accumulator_tile);
    }

    /*
    std::ofstream output("volta_mma_f32_64x64x4.csv");
    output << accumulator_tensor.host_view() << std::endl;
    */

    for (int tid = 0; tid < 1; ++tid) {
        typename MmaTensorOp::IteratorC::Fragment accumulator_tile;

        using FragmentIterator =
                cutlass::epilogue::warp::FragmentIteratorVoltaTensorOp<
                        cutlass::gemm::GemmShape<64, 64, 4>,
                        cutlass::gemm::GemmShape<32, 32, 4>, ElementC, LayoutC>;

        FragmentIterator frag_iterator(accumulator_tile);

        for (int iter = 0; iter < FragmentIterator::kIterations; ++iter) {
            typename FragmentIterator::Fragment frag;
            frag_iterator.load(frag);
            ++frag_iterator;

#if 0
      std::cout << "Iteration: " << iter << " - T" << tid << ": ";
      
      for (int i = 0; i < frag.size(); ++i) {
        std::cout << "  " << frag[i];
      }

      std::cout << std::endl;
#endif
        }
    }
}

/////////////////////////////////////////////////////////////////////////////////////////////////
